Population GrowthAdapted from:http://worldhistoryforusall.sdsu.edu/                                        1
Population Growth               • Between 1000 BCE and 1 CE                world population rose from                about...
Population Growth                    What caused                    this surge in                    population?          ...
Population Growth        #1        In Afroeurasia, iron axes, hoes,  The invention   spades, and plows enabled     of iron...
Population Growth                               #2                      Farming and pastoralFarming and               noma...
Population Growth        #3    Improved    species of      crops    produced   more food per      acre!                    6
Population Growth        #4   Horses and   camels were  used for work!                          #4                    Work...
Population GrowthIt was connected to thebuild-up of naturalimmunities to localinfectious diseases.            #5     Peopl...
Population Growth  In Summary: In Afroeurasia, the invention of  iron enabled farmers to clear and  cultivate millions of...
Population Growth   What were the                    consequencesConsequences                     of population           ...
Population Growth       ConsequencesOver time, the clearing offorests led to soil erosion,shortages of wood for fuel,and t...
Population Growth       Consequences                                     #2                                More complexAs ...
Population GrowthConsequences        #3Collective learning    increased!                      13
Population GrowthCities                          #4                     More people                    began living in    ...
Alexandria                                      • Founded by Alexander the                                       Great in ...
Changan (Xian)• Capital of China during the Han dynasty• Located at the eastern end of  the silk road• Merchants and diplo...
Persepolis• Founded in the 6th century  BCE by Darius I• Capital of the Achaemenid  Empire of Persia• Destroyed by Alexand...
Rome• Political and economic hub of  the Roman Empire• World’s largest city in Big Era  Four, with nearly one million  res...
Teotihuacan                                                         • Major city of the                                   ...
Population GrowthIn Summary:Over time, deforestation led to soil erosion, shortages of wood                              ...
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Population growth

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Population growth

  1. 1. Population GrowthAdapted from:http://worldhistoryforusall.sdsu.edu/ 1
  2. 2. Population Growth • Between 1000 BCE and 1 CE world population rose from about 120 to about 250 million. • This rise was fueled by an acceleration in the rate of growth during this time. • Between 3,000 and 1,000 BCE, it took about 1,600 years for world population to double. • Between 1,000 BCE and 1 CE the doubling time was less than 1,000 years. 2
  3. 3. Population Growth What caused this surge in population? 3
  4. 4. Population Growth #1 In Afroeurasia, iron axes, hoes, The invention spades, and plows enabled of iron! farmers to clear and cultivate millions of acres never before used for farming. 4
  5. 5. Population Growth #2 Farming and pastoralFarming and nomadism!pastoralnomadismreplaced huntingand gathering insome regions.People movedinto previouslyuninhabitedareas. 5
  6. 6. Population Growth #3 Improved species of crops produced more food per acre! 6
  7. 7. Population Growth #4 Horses and camels were used for work! #4 Work animals made farms more productive. 7
  8. 8. Population GrowthIt was connected to thebuild-up of naturalimmunities to localinfectious diseases. #5 People now lived in denser populations! 8
  9. 9. Population Growth In Summary: In Afroeurasia, the invention of iron enabled farmers to clear and cultivate millions of acres never before used for farming. Farming and pastoral nomadism replaced hunting and gathering in some regions. People moved into previously uninhabited areas. Improved kinds of crops produced more food per acre. Horses and camels began to be used more as work animals, making farms more productive. People began to live closer in denser populations. This led to the build-up of natural immunities to local infectious diseases but left people vulnerable to epidemics caused by diseases new to the region. 9
  10. 10. Population Growth What were the consequencesConsequences of population growth? 10
  11. 11. Population Growth ConsequencesOver time, the clearing offorests led to soil erosion,shortages of wood for fuel,and the extinction of somelocal animal and plant species. #1 Deforestation! 11
  12. 12. Population Growth Consequences #2 More complexAs populations grew and societies! Brahmincommunities grew larger, morecomplex, and closer together, Kshatriyaorganization became moreimportant. New political, Vaishyasocial, and economic systemsemerged. Sudra Untouchable The Indian Caste System 12
  13. 13. Population GrowthConsequences #3Collective learning increased! 13
  14. 14. Population GrowthCities #4 More people began living in large cities! 14
  15. 15. Alexandria • Founded by Alexander the Great in 331 BCE • Important trade center • Its library home to many famous scholars There were not only Greeks and Italians, but also Syrians, Libyans, Cilicians and yet others from farther countries—Ethiopians, Arabs, as well as Bactrians, Scythians, Persians, and a few Indians. A Greek orator writing aboutThe Pharos Lighthouse in Alexandria Alexandria 15
  16. 16. Changan (Xian)• Capital of China during the Han dynasty• Located at the eastern end of the silk road• Merchants and diplomats brought trade goods and new ideas 16
  17. 17. Persepolis• Founded in the 6th century BCE by Darius I• Capital of the Achaemenid Empire of Persia• Destroyed by Alexander the Great in 330 BCE 17
  18. 18. Rome• Political and economic hub of the Roman Empire• World’s largest city in Big Era Four, with nearly one million residents• Elaborate water and sewer systems made Rome livable despite its size Not without good reason did gods and men choose this spot as the site of a city. Livy, a Roman historian 18
  19. 19. Teotihuacan • Major city of the Americas located in the valley of Mexico • From 400 to 600 CE, a thriving commercial and agricultural center with 200,000 residents • The Pyramid of the Sun covered as much ground as the pyramidPhoto: University of Arizona of Khufu in Egypt The Pyramid of the Sun, Teotihuacan 19
  20. 20. Population GrowthIn Summary:Over time, deforestation led to soil erosion, shortages of wood Brahmin for fuel, and the extinction of Kshatriya some local animal and plant Vaishya species. SudraWhen communities grew larger, Untouchable more complex, and closer together, new political, social, and economic systems became necessary.Collective learning increased, further fueling advances in technology.Although the vast majority of people still inhabited rural farming villages, more people than ever before began living in large cities. 20

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